Need advice

I had a baby almost 2 months ago. My fiancé works midnights so he's gone all night and sleeps all day. He doesn't get many days off and when he does he sleeps half the day away. I feel like I'm doing this on my own. I'm exhausted as our son will not sleep without being in the bed with me, which is a habit I'm trying to break as I don't sleep when he's in bed with me. I maybe get 3 restless hours of sleep a night.

I feel so guilty asking my fiancé for help because I know he's working. My mom makes me feel really guilty about it too and is always going on about how he needs his sleep and working night shifts is really difficult. I feel like nobody cares that I'm slowly losing my mind from no sleep.

When my fiancé does have a night at home he doesn't even attempt to help with the middle of the night stuff. He watches me struggle to get out of bed half asleep to feed and change our son and rolls over and goes back to sleep.

I don't know what to do. I need help but I feel to guilty to ask for it.